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1993 Sedan Deville 60 special 4.9L FWD - A/C on but HVAC blowing only hot air in

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Daily weather now getting around 90F degrees by mid-morning
Went to check how A/C was functioning to just get HVAC fan on, no cooling at all
HVAC set to auto and coldest setting of 60F degree

Checked the on-board diags, no DTCs at all for ECM and BCM
Also used an OBD-I scanner and also showed no DTCs as all
Scanned, the BCM and PIDs clearly show the A/C being commanded on and off cycling
Checked Freon, at idle, low is about 40 PSI and high around 230 PSI, weather at the time was 85 F degrees

Seems like the clutch of the compressor keeps going on for maybe 30 seconds, then off and keeps cycling this way
HVAC screen and buttons seem OK, press auto and stays there, showing high speed for HVAC fan

What could the cause be to debug, why clutch commanding on/off ?
What else to check and debug ?


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